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Hot electron induced NIR detection in CdS films.

Alka Sharma1,2, Rahul Kumar1,2, Biplab Bhattacharyya1,2

  • 1Academy of Scientific and Innovative Research (AcSIR), National Physical Laboratory, Council of Scientific and Industrial Research, Dr. K. S. Krishnan Marg, New Delhi, 110012, India.

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|March 12, 2016
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Summary

We enhanced cadmium sulfide (CdS) photodetectors using gold (Au) nanoislands to improve light absorption in the visible to near-infrared (NIR) spectrum. This plasmonic approach enables high-performance, cost-effective photodetectors for light harvesting applications.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Optoelectronics

Background:

  • Cadmium sulfide (CdS) photodetectors have limited absorption beyond the visible spectrum.
  • Enhancing light absorption in photodetectors is crucial for expanding their application range.
  • Plasmonic nanoparticles offer a route to tune optical properties of semiconductor materials.

Purpose of the Study:

  • To enhance the absorption properties of CdS photodetectors into the near-infrared (NIR) spectrum.
  • To investigate the role of gold (Au) nanoislands in improving photodetector performance.
  • To demonstrate a cost-effective method for fabricating high-performance visible-NIR photodetectors.

Main Methods:

  • Fabrication of random gold (Au) nanoislands on CdS films using temperature-dependent annealing.
  • Characterization of optical properties and photo-detection performance.
  • Optical simulations to understand the dependence of sensitivity on nanoisland size and shape.

Main Results:

  • Achieved enhanced absorption in CdS photodetectors extending into the NIR spectrum.
  • Demonstrated high responsivity (~780 mA/W) in hot electron-induced NIR photo-detection.
  • Simulations confirmed that NIR sensitivity strongly depends on the size and shape of Au nanoislands.

Conclusions:

  • Random Au nanoislands effectively enhance CdS photodetector absorption and performance in the visible-NIR spectrum.
  • Plasmon enhancement of IR sensitivity is achievable with cost-effective fabrication methods.
  • This approach holds potential for economical light harvesting and future technological applications.